const fp = require('lodash/fp')
const cars = [
    { name: 'Ferrari FF', horsepower: 660, dollar_value: 700000, in_stock: true },
    { name: 'Spyker C12 Zagato', horsepower: 650, dollar_value: 648000, in_stock: false },
    { name: 'Jaguar XKR-S', horsepower: 550, dollar_value: 132000, in_stock: false },
    { name: 'Audi R8', horsepower: 525, dollar_value: 114200, in_stock: false },
    { name: 'Aston Martin One-77', horsepower: 750, dollar_value: 1850000, in_stock: true },
    { name: 'Pagani Huayra', horsepower: 700, dollar_value: 1300000, in_stock: false }
]
const isLastInStock = fp.flowRight(fp.prop('in_stock'), fp.last)

const getFirstCarName = fp.flowRight(fp.prop('name'), fp.first)


let _average = function (xs) {
    return fp.reduce(fp.add, 0, xs) / xs.length
} // <- 无须改动
let averageDollarValue = fp.flowRight(_average, fp.map(car => car.dollar_value))

// console.log(averageDollarValue(cars))

let _underscore = fp.replace(/\W+/g, '_')
let sanitizeNames = fp.flowRight(fp.map(fp.flowRight(fp.toLower, _underscore)))
console.log(sanitizeNames(["Hello World"]))